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what do you think may happen to the leading edge of oceanic crust as it continues to move downward ?

Sagot :

Since the mantle is hotter than the crust, the tendency is, the subducted crust melt forming magma. Addition of volatile material such as water will cause the magma to become less dense, hence allowing it to rise and reach the crust once again and causing volcanic activities on the continental leading plate.

-Jhoey :)